Merge pull request #155 from patrickarlt/master

RC 2 + Documentation
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Merge branch 'master' of github.com:Esri/esri-leaflet
adds the beginnings of a directions demo including getting an access token via oauth
implements directions. replaces geocoder with new esri-leaflet-geocoder
Merge pull request #160 from aaronpk/directions-demo

Directions demo
Merge remote-tracking branch 'upstream/master' into imageserverlayer